Compact spectroscopy system based on tunable organic semiconductor lasers

Continuously tunable solution-processed organic semiconductor DFB lasers pumped by laser diode

“…Continuous tunability of such solid-state organic DFB lasers has already been demonstrated with several approaches such as holographic dynamic DFB gratings [12], stretchable DFB lasers [13][14][15][16][17], a wedge-shaped film of either the gain material layer [18] or an intermediate high-index layer [19], a continuously changing grating period [20], optofluidic tuning [21], tuning the temperature of the device [22] or DFB lasers that incorporate liquid crystals [23,24]. Furthermore, the general applicability of a wedge-shaped organic DFB laser using evaporated small molecules with a continuous tuning range of up to 25 nm has been demonstrated in spectroscopic and laser-induced fluorescence measurements [25,26]. Organic semiconductor DFB laser chips with a spatially varying lasing wavelength can be tuned quickly by using a pump pulse synchronized rotation scheme [25].…”

“…Furthermore, the general applicability of a wedge-shaped organic DFB laser using evaporated small molecules with a continuous tuning range of up to 25 nm has been demonstrated in spectroscopic and laser-induced fluorescence measurements [25,26]. Organic semiconductor DFB laser chips with a spatially varying lasing wavelength can be tuned quickly by using a pump pulse synchronized rotation scheme [25]. In both cases, the thickness gradient of the active layer was fabricated by thermally co-evaporating the small molecule tris(8-hydroxyquinoline) aluminum (Alq 3 ) and the laser dye 4-dicyanmethylene-2-methyl-6-(pdimethylaminostyryl)-4H-pyran (DCM) with a rotating shadow mask evaporation technique.…”

Plastic lab-on-a-chip for fluorescence excitation with integrated organic semiconductor lasers

“…Based on first order DFB, OSLs emit directed single mode polarized light in the chip plane. They feature a broad spectral tuning range [15,16], low threshold [17], and are suitable for spectroscopic [18] or laser-induced fluorescence [19,20] applications. OSLs must be pumped optically.…”

Organic semiconductor distributed feedback (DFB) laser as excitation source in Raman spectroscopy

“…Relying on distributed feedback (DFB) resonators, it allows the simple fabrication of laser devices with narrow bandwidth and low laser threshold, both being favorable for Raman spectroscopy. Recently, organic semiconductor DFB lasers (DFB-OSL) have been applied for high resolution absorption and transmission spectroscopy [23][24][25]. As a promising candidate of excitation source for Raman spectroscopy, however, the DFB-OSL has to be improved through advanced fabrication techniques.…”